What is the mass percent of FeCl3 in a sample if 0.34g of chloride is precipitated as AgCl by the addition of 25mL of 0.1M AgNO3, and excess AgNO3 is back-titrated with 12.6mL of 0.1M KSCN?
a) 46.88%
b) 52.94%
c) 58.82%
d) 63.64%